After testing a lot, I found what seems like a bug. With the normal flow, saving individual files works as expected, if I press Cmd+s, the file is saved and automatically deployed to the SF server.
On the other hand, with sfdx orgs, this doesn't happen and I have to either select the Save all option in IC or explicitly click push.
I recorded a small video of the bug. Even tho it's very low quality, you may be able to appreciate what I mean. When I press Cmd+S the menu file on the top left corner highlights, but nothing happens.
As a heads up, the
.forceignore is empty :)